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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba09881b847728ff93c0819b38bced708faf7dd08d3195bb3f13551fc07068c' 
  AND token = '0Bh0RvyDctko1lvp+B0EacUcZV5H4VddPZ+AvM1LNAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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