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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc5c39de4f3d6a262833cc8a2e46ce10b81d85ac917714009c4e250e7e6cd3a' 
  AND token = 'zb7RBzJfpVBsOZ1qHtTvSGzRIbI0BsZG2HrkyCzAmqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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