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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085c5b4691621f1a7485f0cf055ce187e169ce2aff58577f1e9f9341977b9083' 
  AND token = 'TCZN6vjeUgw3tNeEK+dSrV/xJLtQJupXPNxlV8pfjtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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