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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce7d5b9b4f3f7c78d94c7b608760b2d5ba320e15c3f122be4d31fa26c039533' 
  AND token = '8GTTX7gjKMJfcs2XztfntJcAPPxuwFzK+46/M/Fn9fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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