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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0873a19db832227f733005c46393beb0ef1c211873d715fe1be2db6c5c9525b' 
  AND token = 'RKRxqry9ftkErR5+EV4Ds7fHFNGORULxpaT+wjGCWEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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