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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a49d4bd994f3527d6db1214687661d8bd97a8c6c58811236121ea1273a33d5f' 
  AND token = '4LZ0dJGSzzPLx3Ko4iWHsN7WvxucaYbY14deQROEypU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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