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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f330909a019d60d2a12599e71d899f57329bfd7d44e17df26c59284ab3313ee7' 
  AND token = '4OH19YgYk4h9PlBKZjPVBYZ3QUua9M97Fcl0MJsyxdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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