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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e7583f20ef3484bc91b56cfd1777209802ac6366523ede3271b39714e32c89' 
  AND token = 'yOevbffhD4i117j6hmMe46az9g2t2FEITMk9fsm7bYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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