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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '782a4bd8842878f60c24e19b925e38d27a8b1942e1dbfb7c9565fb11571d7da2' 
  AND token = '98DPxmCpyMLGOiOlXBKyS/GqnRtnpuElo3y8JocgP3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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