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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3f5bf2428be1e218381475de16fb7e75f81ed2b73ddc7309e522d36836782b' 
  AND token = 'A8semNiYDOw+3wJjuOuoPFECr4eVCm3Ho9tV7VWBLTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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