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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8ad5712be20e9c3c55b5fbb251146f3dec5274c87433165dfa2a0ada3673a5' 
  AND token = 'ogqtDU1Mh1rcjbIko1H36ESGFUmtMq1MGzuN143oGbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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