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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85a81c245d976cedbb0b1a6ff669cab795a19a20e8ec6ba73c11ab2dc29f193' 
  AND token = '7QBuofBPV/8N51Ty2BnXYFnpDhp86WpX152aw/kGu2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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