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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e74e143980143cf8ef434245eb4c3f9f60277b76eb93d05b1e1fad82c2a2d9' 
  AND token = '3vbv9IQiaAFu+WI/p4oFp2ETaojMp3t0ZtAOPOgQwec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}