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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a755a5b76466ba68f5afa6f2f4112629378999fc14fa2cbd59018e3a2a399157' 
  AND token = 'SNDBFa5WgyWxhXEzglaEVpLRJHYX2BH0C9DNMF3Q87A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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