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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836f5a9d9c1d2a7df0e49f81cb027bddbf42f931343a7ea138051ce676442a5e' 
  AND token = 'LvI/ru6TQM3A6VEyOwoZjp9vYqc80ReRxWxkiuGDMlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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