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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa1de797b720d7f06da24109aed958def4cc88148787d67d3ce91b18f22f34b' 
  AND token = 'OkbXpKEluHrK82nICe0G5tdBVeNH4aLvy+AJ9BrBIyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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