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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2a7331f3ff5661b161e4ccd5cf5aecc6b016a8d24b49dd50e1c95512e696cb' 
  AND token = 'C0PMfZ8Ynx1fwkc+9h7wHHjdNLDrS2Cre692Ht4LY7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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