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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0ba11310012abe6a5ce0f46db91fc6e1cef0b9d33a04f0e3bf3a33777c1c74' 
  AND token = '3hDScHZxpVH3u/F4QUFSFqdvfahap8EX0mRchIytNsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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