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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7db62c0dee6e99e31bb86e792f4c82066ec278ba1bb8df7d437255c7dd6179' 
  AND token = 'g/5hb2sym90MT73pIv0RlIqxsKxCTGAliZqPprKk2Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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