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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8dd15600e07544f57517923664942cf61b8d1f171828d95138be5509aa81f1' 
  AND token = 'yFKt+anUkvIwdz3HS7oKZ6yUb/hOsNpssEHm59tZ7IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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