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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1eaa0af03229352432a438e023a88df114e4981fa7e3220c50b9465b5733ffa' 
  AND token = 'JOneITabr4VwZl7vwwkcGWS9Wl3washHSJroyEmd3aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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