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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91683b06dfaca8c6c5835524877c39884094ad6f4919b6ae15c43880611a1b5b' 
  AND token = '6vueTPzCIrU9naykx4+S7LWJyqXphSzc7MYrOSjxZ7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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