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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a7e5e6465d2591c3efb13a4dd3de3e4684577b329320a8e990697ff16dba13' 
  AND token = '8TXNFrj37BFC1rgW5fjacOJFuLdp32y6VVqWeZK4a9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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