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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a0e94a44126827ee055bf241aca27aa45b6e2752d830f144e72fa70ca3d6d50' 
  AND token = '8Ndxf4y15A1cWZFLhTJ4OyzXEGPRYzFjFbIy2HenjWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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