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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8fa2cd5350bd32b1306c699f9f21137201bfa8376bb6eccf81732b69ef0bac9' 
  AND token = '7O0UOBcuL9ER2T/6fDPpuV2uQay+wRKKkffE3Ej8J9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00304

JSON explain

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