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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611a4e0b6ddcdb17d0fbb62a24601db7ef8fa66c4b66147414f4d9837b107f6d' 
  AND token = 'HKx3nnzIll4SZEVU03+8dEYOv1RVwQAa30cAf0U0U3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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