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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87e881bc201cc8be342b79e89918148650cf7ef35903b7e60c55752bb99600a' 
  AND token = '/2mMXEoCKrbuDYChP/zGcUq+t6by5NR8JzVJk2Zr5UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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