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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f2f02cf868c0d57bcdfe076ee640891d29fc4f7e5aa98929c06f03b14c599c' 
  AND token = '2sQGT1Rry5B+Z2SEpFEkBHXnnVQJMSQIHzzfKQgWQ/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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