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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fe3eb7dfa132e861a831e5ee6a007cd9e031ea0842f5930cd7473c070ff92d' 
  AND token = 'mNjKheUJApPHC+0R4lebvLF4GU7Ug2DlgPyQh3q3cUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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