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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77838ba05ccbfa21660d10ed9a44e7f6c7d1784e00aa7bb0998c164335b97aa9' 
  AND token = 'EKtKORkqQwUizXDx7Tj7yv4PHfiRwid3adtKX0anKh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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