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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c25fba09266f19630631c58ecdd97f91d460f1b7b66085a2c2465995d96e958' 
  AND token = 'bXx6ejQixgOMrJ8gXplfHzlw2AjkSv3JpkJ3r20gbVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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