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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b92d45b84c723b907b67c745846eb660b0ffd5e0af8f2b5fb40a386e9948529' 
  AND token = 'Ve78tvfyEI6ymdl7cAhZ6tp86nbnUGx65PEsyAX15J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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