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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c465ecbcb05959e5c46f27ac9f7335e80482b1a1e0a6edffff8725ec8f64dc' 
  AND token = '42PGKg8ibfpS2sY0Q19/E2vgEzvlS6G4JdkB6cUlmKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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