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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce05d6c9516554fc1a24e3df9655eea6c97db0e8fcf2512aa870b3a73cf6542' 
  AND token = 'EEnzW116V3ILqqQHvQywuGA2JUcZt2Reu2Xpt2So5Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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