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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9b6a50a49179ad65b2ecc54a4d1e855470942dcce2eb55c808b56600547601' 
  AND token = 'FTQ1FX7Ukr1AQFAMx99JEuE3fLYEXNw7I+eBmRN7lfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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