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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e1998161d5d641763c4707549646390532154e901a8d66fe5bddb1ef052493' 
  AND token = 'MZlBDrbL4RDEKt8GP5ppT07nXhtx6Ec68wygH8cdCfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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