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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc89b77f408bc0fd0d1083b920c89d118a21d4f4f2f6be83a53531a0156c854c' 
  AND token = '9tx5lVpMcjBG0tbVnpwVaScaxImFFdAUNeH1Ru4FBcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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