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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd68092a7b5f268cc1bd0b0957c01116ce7b65ab359efb1ccd1b051efba608b' 
  AND token = 'B6JOTxAh1S9DgZQxQd0q2LaMqEieNMfGs5g5C6RzVYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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