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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d6bc3f89c072186a555dee418152502c2d393f985c8c16759cd60317ac5ef6' 
  AND token = 'rfnzhe8mly27stBHQPFrhDuLKZ3Hfuz47R+F9zYmIJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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