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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa268651c3701a4786852951a987d2d5e0d120014dd8c9508aeaeba28ea4261' 
  AND token = 'lJDk5qEK4B+aGaxysUZgXVGa53ACOD5DWmRgImOzHvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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