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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f8c60ca7d33ae5e89731b6f6b2c7c7235b5954dc33bc6737395f72c5246d21' 
  AND token = 'Bhpggm90/bHlkLg+tj47H6JtvXg9bCby6HtG5ALCvag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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