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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10cf6ec902f72cbae06c798df69e0cceafd5c5b8d47c9fb2e979e6cb8076979' 
  AND token = 'E7F0jBIXB2cn9FifL5R3bd9PGuwRMpSLlVkgCwP+2TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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