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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77577364aab7ecee428a181dd9a3cad596b1ffff9421545d73bab7f4a787ef9d' 
  AND token = 'pAkiIc5x08ejYcxzA2iLrW91KL/fAjLRpv0RiF9Pi2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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