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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5adb5f156c1a2430b32cc6d105cbdf32b50711c52b4eeba63c01009989f85c80' 
  AND token = 'C+3EnbQzZOOdLClNkUuOL0V7Wj9bCViLcdJUfxH2/V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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