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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bd6fb63f6fed9358b9c04c48c59ab3b58fea77b8d80cd7b6df50f55c6e134c' 
  AND token = 'n7PPfrSOVKp5VWplUr7EjE9RHXPnmk6b/r3ziFSHejI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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