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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29f38d116d6cd9e6a1ef77297ac862e05b89750db1a992a74672ab9a262f8e9' 
  AND token = 'jY5fmCxLD1rV4NjTPZ0G6sxJp1tQnpSDm1HPSlId/Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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