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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e7777c6fbe93b48ef795329e5baa8194e3826a090df0cb998d77397cece576' 
  AND token = '9qVKvExKlnrq1wQ+oJyCn+4RODL+I1FBdgeR5xyxi1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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