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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff1d44a91b6571cacb6442c2cb7099ddc89aec8c8a2dcd7c1b924afa3ef1ff1' 
  AND token = 'UFIBwNuduezRvVdKiZN8qUqKH6Qz80L/Dk9pbqnM3os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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