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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a827b13dcbf2ed6006c833ef4eecb46203fc3381f364a50c908b2a91dfc26a3d' 
  AND token = 'bOq+5yXfO0sno1HAU0g49LdWFe2BFYX3yseu0Wcp0VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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