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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c67b32f653f8bca3a9553f71ebf0d63dfba3a6a15d65bb0ff349d32cd7ad701' 
  AND token = 'tNtBcNoL0xYCHrh1bOcz4qBS1/v7x0c9/OU8vO8d6I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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