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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e709e2218fbf0fde578c6cfa0b2b8a6fe2c353042973ef917c8e09f5ef993f3' 
  AND token = 'vLdEowzoNRw++iw7qRd3nY+trvAeejms3+e9SD1SgK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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