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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974d4fd3836789208e3c76789da3584fd9937f6658be79064162840c05d74f53' 
  AND token = 'q5OCOeufmK2LOJqd9+q4QHw3O7/AKd4YiauNRV8DIQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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