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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc97a1c984324dc198fbf045981887f9e0aab5b5ba07a6395c442c40477368b2' 
  AND token = 'PJJOCfqs4pwt8KBY8FApxZDPcxy+BSRW5B2rnxcDAHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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