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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c87bb6e81f8c5ad7f747992a1dea235b9db9cc9d39ff0bb568d728f2d5d617e' 
  AND token = 'PVk7YsudMLxIoVkMFY5YilJYgvFN4HeX5VaYmVLNxek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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