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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ab33e83b2763ebe078388557e657ca3162c0c991a9c9a937cb2d4883a5a26e' 
  AND token = 'yamzuKiP35cfaIDkdam7U0JfmC1HEZQKAm7hm2nGJeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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