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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9391bcb3d5b904e90ba9957a6775ec9ec80fc3391697588b474d47af5c7ccd8a' 
  AND token = 'MnANcLsm51Q/LI0RBSrDvLdqWAVBHrNLbzemikHYk3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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