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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f05d7ada9ad11c48f2a33d5a062d95222f753533c0d7c7419262c19f5dc6aec' 
  AND token = 'eSunx93PYA9VbuAb7sl6dKi5qs3u/XLkumlunvvy+K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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