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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebde39854934ebab840e410c2b0722c9183d9334326c546bd33680b372848405' 
  AND token = '4eaGd7kmq7NZ9OIwozbb0jaLODvVrixS1BxWY88S0lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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