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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc2799d5d7790b5d628aaa7751f784c7dfbd257c4535793007a0c02fef6263d' 
  AND token = 'V/3Zku8PKdaJtrQ6/1fjqfmFR5PsX7YDPxvMRMioXtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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