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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bc4ab2aa8e8d1134b3d98c407e27cf20d82c2dc78bc97554853e4640e4ce62' 
  AND token = 'dsMSnb9aHN3788aB76+Y6qS2QwaRuvkOTBp26+Bph0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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