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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998ca4e572dfbe28d339d6cabd0d152ec55d308596cb709a924e153bd8df27f3' 
  AND token = 'yBvcfFUuX78+bQVRHOdFIMzc6JrwiPHCt3P+tx4qsD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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