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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c0d19e842449669e3e33e99847df607b8eea3877fa1c039b2a13fc92485d34' 
  AND token = 'EA0n2aHap+3o6GlcRW+O6Oy24jGxZIOsx/F3Z1axv0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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