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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296bd410b77a7b2d00d51536d617061e2ff3246fc279b15cd26605cb500488c3' 
  AND token = 'flgof2vSQgPS58zYe8W1f0L4KMXZ8EhILNxRMlH2Huk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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